EP2532504B1 - Two-color molded article and production method thereof - Google Patents
Two-color molded article and production method thereof Download PDFInfo
- Publication number
- EP2532504B1 EP2532504B1 EP11739791.9A EP11739791A EP2532504B1 EP 2532504 B1 EP2532504 B1 EP 2532504B1 EP 11739791 A EP11739791 A EP 11739791A EP 2532504 B1 EP2532504 B1 EP 2532504B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- primary
- face
- molded article
- base part
- bottom face
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Not-in-force
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1635—Making multilayered or multicoloured articles using displaceable mould parts, e.g. retractable partition between adjacent mould cavities
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
- B29C2045/1682—Making multilayered or multicoloured articles preventing defects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/36—Moulds having means for locating or centering cores
- B29C2045/363—Moulds having means for locating or centering cores using a movable core or core part
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
- Y10T428/24612—Composite web or sheet
Definitions
- This invention relates to a two-color molded article and a process for production thereof, in which a secondary-side resin flow path is formed on a perimeter of a primary-side decorative raised part being formed on a design face side of a primary-side molded article and configuring a character, figure, or other decorative part, the secondary-side resin flow path running through from the design face side to a bottom face side of the primary-side molded article, and a protective wall is formed on the bottom face side of the primary-side molded article, the protective wall surrounding a perimeter of the secondary-side resin flow path, whereby the production of gas burns or weld lines, which are produced during secondary side molding, can be prevented.
- Connect-through holes are formed respectively on the inside and outside of the closed region on a primary-side molded article being molded by the abovementioned two-color molding process, the connect-through holes running through the primary-side molded article from top to bottom.
- a slide core is placed on the bottom face side of the primary-side molded article, and the slide core is retracted, whereby resin of the secondary-side molded article is filled inside a lower-side space part formed between the bottom face of the primary-side molded article and the slide core.
- the filled resin passes through the connect-through hole, and flows in to the inside and outside of the closed region formed on the design face side of the primary-side molded article.
- Patent Document 2 discloses a two-color molded article in accordance with the preamble of claim 1.
- the present invention was created in consideration of the abovementioned problem of the prior art, and an object it to make it possible to prevent the production of gas burns or weld lines produced during secondary side molding.
- the present invention was created in order to achieve the abovementioned object, and the two-color molded article according to the present invention is characterized by the following points.
- a two-color molded article has a perimeter of a primary-side molded article roughly covered by a secondary-side molded article.
- the primary-side molded article has the following configuration.
- the two-color molded article according to the present invention may be characterized also by the following point.
- a volume of the design face-side molded part and a volume of the bottom face-side molded part are set to an equal volume ratio.
- the primary-side molded article is surrounded by the resin of the secondary-side molded article, and the volume of the design face-side molded part and the volume of the bottom face-side molded part are set to an equal volume ratio, whereby the forces of contraction of the resins can be brought into contention on the top and bottom of the two-color molded article, and the occurrence of warping can be cancelled out.
- the two-color molded article according to the present invention may be characterized also by the following point.
- the intersecting face intersects with the upright face at a right angle or at an acute angle.
- the two-color molded article according to the present invention may be characterized also by the following points.
- the intersecting face is positioned on both sides of the upright face.
- the dead-end part the dead-end part is surrounded on three sides.
- the two-color molded article according to the present invention may be characterized also by the following point.
- the secondary-side resin flow path faces either the upright face or the intersecting face.
- the secondary-side resin flow path can be placed suitably on the dead-end part where gas burns or weld lines are easily produced.
- the two-color molded article according to the present invention may be characterized also by the following point.
- the protective wall is formed in a cylindrical shape.
- the two-color molded article according to the present invention may be characterized also by the following point.
- the protective wall is formed straddling two or more adjacent secondary-side resin flow paths.
- the protective wall can be suitably formed.
- the two-color molded article according to the present invention may be characterized also by the following points.
- the process is for production of a two-color molded article having a perimeter of a primary-side molded article roughly covered by a secondary-side molded article.
- the primary-side molded article is primarily molded.
- the primary-side molded article has the following configuration.
- the two-color molded article according to the present invention may be characterized also by the following points.
- the movable-side die has a slide core to be inserted into the secondary-side resin flow path.
- the slide core is retracted during retraction of the movable-side die, whereby secondary molding resin filled from the design face side of the primary-side base part is allowed to flow to the bottom face side.
- the two-color molded article according to the present invention may be characterized also by the following points.
- the movable-side die has a slide core to be inserted into the secondary-side resin flow path.
- the slide core is retracted during retraction of the movable-side die, and the retracted slide core is brought to a stop inside the secondary-side resin flow path.
- the production of gas burns or weld lines, which are produced during secondary side molding can be prevented by forming the secondary-side resin flow path on the perimeter of the primary-side decorative raised part being formed on the design face side of the primary-side molded article and configuring a character, figure, or other decorative part, the secondary-side resin flow path running through from the design face side to a bottom face side of the primary-side molded article, and forming the protective wall on the bottom face side of the primary-side molded article, the protective wall surrounding the perimeter of the secondary-side resin flow path.
- the molten resin having been injected from the design face side of the primary-side base part and having turned in toward the bottom face side past the perimeter of the primary-side base part is blocked by the protective wall and does not intersect with the molten resin having been filled inside the protective wall through the secondary-side resin flow path.
- the production of gas burns or weld lines which are easily produced in the dead-end part of the primary-side decorative raised part, can be prevented in advance.
- the production of gas burns or weld lines, which are produced during secondary side molding can be prevented by forming the secondary-side resin flow path on the perimeter of the primary-side decorative raised part being formed on the design face side of the primary-side molded article and configuring a character, figure, or other decorative part, the secondary-side resin flow path running through from the design face side to a bottom face side of the primary-side molded article, and forming the protective wall on the bottom face side of the primary-side molded article, the protective wall surrounding the perimeter of the secondary-side resin flow path.
- the decorative part 20 was illustrated as an English letter "E" as an example, the invention is not limited to this, and the decorative part may be another character, figure, symbol, or the like.
- the two-color molded article 10, broadly divided, is configured with the following parts, as illustrated in FIG. 7 .
- the parts of the two-color molded article 10 are not limited to the above (1) and (2), and two or more kinds of colors or resins may be used.
- the primary-side molded primary-side molded article 30 is made using ABS (Acrylonitrile butadiene styrene) or another thermoplastic resin having a suitable degree of rigidity.
- the material for molding of the primary-side molded article 30 was illustrated as ABS as an example, the invention is not limited to this; for example, PP (polypropylene) may be used.
- the primary-side molded article 30, broadly divided, has the following parts, as illustrated in FIGS. 8 to 16 .
- the parts of the primary-side molded article 30 are not limited to the above (1) to (5).
- the secondary-side molded article 40 is as follows:
- the design face-side molded part 100 is filled from the design face side of the primary-side base part 50 and covers the perimeter of the primary-side decorative raised part 60, as illustrated in FIGS. 1 , 3 , 5 , 6 , and 7 .
- the design face-side molded part 100 is molded using molding material of the secondary side that is injected from a gate of a stationary-side die 200 to be described and is filled between a cavity of the stationary-side die 200 and the design face of the primary-side base part 50, as illustrated in FIG. 1 .
- the bottom face-side molded part 110 turns in toward the bottom face side from the design face side of the primary-side base part 50 and covers the bottom face side of the primary-side base part 50, as illustrated in FIGS. 1 , 3 , 5 , 6 , and 7 .
- the bottom face-side molded part 110 is molded using molding material of the secondary side that turns in toward the bottom face side from the design face side of the primary-side base part 50 and is filled between the cavity of the movable-side die 300 to be described and the bottom face of the primary-side base part 50, as illustrated in FIG. 1 .
- the volume of the bottom face-side molded part 110 and the volume of the design face-side molded part 100 are equal.
- the thickness of the design face-side molded part 100 is set to "1.3 mm” and the thickness of the bottom face-side molded part 110 is set to "1.1 mm.”
- the reason why the thickness of the design face-side molded part 100 is set thicker compared with the thickness of the bottom face-side molded part 110 is because the primary-side decorative raised part 60 to be described is formed on the design face side of the primary-side base part 50.
- the interspersed molded part 120 flows through the secondary-side resin flow paths 80 and 81 to be described from the design face side to the bottom face side, and is interspersed at a distance from the bottom face-side molded part 110 with the protective wall 90 in between, as illustrated in FIGS. 1 , 5 , and 7 .
- the interspersed molded part 120 is molded using molding material of the secondary side that flows through the secondary-side resin flow paths 80 and 81 to be described from the design face side to the bottom face side and is filled inside the protective wall 90, as illustrated in FIG. 1 .
- the primary-side base part 50 is formed in a plate form as illustrated in FIGS. 8 to 13 .
- the primary-side base part 50 is held in sandwich form from the top and bottom faces between the design face-side molded part 100 and the bottom face-side molded part 110 and is embedded between these molded parts 100 and 110 during secondary molding, as illustrated in FIG. 1 .
- the primary-side decorative raised part 60 projects from the design face side of the primary-side base part 50 and configures the decorative part 20 including the English letter "E," as illustrated in FIGS. 14 and 15 .
- the primary-side decorative raised part 60 has the following faces, as illustrated in FIGS. 14 and 15 .
- the faces of the primary-side decorative raised part are not limited to the following (1) to (3).
- the upright faces 61 and 62 stand upright from the primary-side base part 50, as illustrated in FIGS. 14 and 15 .
- the upright faces 61 and 62 are positioned on the outside face of the perimeter of the primary-side decorative raised part 60, and are embedded inside the design face-side molded part 100 during secondary molding.
- the upright faces 61 and 62 were illustrated as two faces as an example, the invention is not limited to these, and the upright faces may be configured with one or three or more faces.
- the intersecting faces 63 to 66 intersect with the upright faces 61 and 62 and stand upright from the primary-side base part 50, as illustrated in FIGS. 14 and 15 .
- intersecting faces 63 to 66 intersect with the upright faces 61 and 62 at right angles or at acute angles.
- intersecting faces 63 to 66 are positioned on both sides of the upright faces 61 and 62.
- intersecting faces 63 to 66 were positioned on both sides of the upright faces 61 and 62, the invention is not limited to this, and the intersecting faces may be positioned on one side of the upright faces 61 and 62.
- the intersecting faces 63 to 66 are positioned on the outside face of the perimeter of the primary-side decorative raised part 60, and are embedded inside the design face-side molded part 100 during secondary molding, in the same manner as the upright faces 61 and 62 are.
- intersecting faces 63 to 66 were illustrated as four faces as an example, the invention is not limited to these, and the intersecting faces may be configured with one to three or five or more faces.
- the top layer face 67 is positioned on a top layer of the secondary-side molded article 40, that is, the upper face of the primary-side decorative raised part 60, as illustrated in FIG. 14 and 15 , and is exposed from the design face-side molded part 100 during secondary molding.
- the dead-end parts 70 and 71 are positioned on the primary-side base part 50, are at least surrounded by the upright faces 61 and 62 and the intersecting faces 63 to 66, and are positioned outside of the primary-side decorative raised part 60, as illustrated in FIGS. 14 and 15 .
- dead-end parts 70 and 71 were illustrated as two parts as an example, the invention is not limited to these; for example there may be one or three or more dead-end parts in the case of a character, figure, or symbol other than the English letter "E.”
- the secondary-side resin flow paths 80 and 81 are formed in the dead-end parts 70 and 71 and run through the primary-side base part 50 from the design face side to the bottom face side, as illustrated in FIGS. 9 , 13 , and 14 to 16.
- the secondary-side resin flow paths 80 and 81 face either the upright faces 61 and 62 or the intersecting faces 63 to 66, as illustrated in FIGS. 14 to 16 .
- the secondary-side resin flow path 80 faces two faces between the upright face 61 and the intersecting face 64, as illustrated in FIGS. 14 to 16 .
- the secondary-side resin flow path 81 faces two faces between the upright face 62 and the intersecting face 65.
- the secondary-side resin flow paths 80 and 81 were arranged to face two faces, the invention is not limited to this, and the secondary-side resin flow paths may face one face or three or more faces.
- section of the secondary-side resin flow paths 80 and 81 was formed in a fan shape, the invention is not limited to this, and the section may be formed in a circular shape, oblong shape, elliptical shape, square shape, or geometric pattern shape.
- the protective wall 90 projects from the bottom face side of the primary-side base and surrounds the perimeter of the secondary-side resin flow paths 80 and 81, as illustrated in FIGS. 9, 13, and 14 to 16 .
- the protective wall 90 is formed in a tube shape, for example, a cylindrical shape.
- the protective wall 90 was illustrated as having a cylindrical shape as an example, the invention is not limited to this, and the protective wall may be formed in an angular tube shape.
- the protective wall 90 is formed straddling two or more adjacent secondary-side resin flow paths 80 and 81.
- the protective wall 90 was formed straddling two or more adjacent secondary-side resin flow paths 80 and 81, the invention is not limited to this, and a total of two protective walls may be formed independently straddling two or more adjacent secondary-side resin flow paths 80 and 81.
- the dice Describing the dice first, the dice, largely divided, is configured with the following dice.
- the dice are not limited to the above (1) and (2).
- a cavity is formed on a top face of the stationary-side die 200, the cavity conforming to the shape of one half, that is, the design face side, of the primary-side molded article 30 and the secondary-side molded article 40, as illustrated in FIG. 17 .
- a gate fronts on the cavity are not illustrated.
- a slide core is advanced into the cavity of the stationary-side die 200, and the primary-side decorative raised part 60 of the primary-side molded article 30 is molded.
- the movable-side die 300 is configured to be movable against the stationary-side die 200, and a cavity is formed, conforming to the shape of the other half, that is, the bottom face side, of the primary-side molded article 30 and the secondary-side molded article 40, as illustrated in FIS. 1 and 17.
- the movable-side die 300 has the following cores, as illustrated in FIG. 1 .
- the cores of the movable-side die 300 are not limited to the following (1) and (2).
- the slide core 310 is supported to be capable of sliding on the movable-side die 300, and is inserted into the secondary-side resin flow paths 80 and 81 during primary molding, as illustrated in FIG. 1 .
- the slide core 310 is retracted during retraction of the movable-side die 300, and secondary molding resin filled from the design face side of the primary-side base part 50 is allowed to flow to the bottom face side, as illustrated in FIG. 1 .
- the retracted slide core 310 is brought to a stop inside the secondary-side resin flow paths 80 and 81, as illustrated in FIG. 1 .
- the amount of retraction of the slide core 310 is set smaller than the amount of retraction of the movable-side die 300.
- the primary-side deformation-preventing core 320 does not move during retraction of the movable-side die 300, and a state is maintained, in which the primary-side deformation-preventing core is abutted to the end face of the top end part of the protective wall 90 of the primary-side molded article 30, as illustrated in FIG. 1 .
- the shape of the protective wall 90 during secondary molding is maintained by the primary-side deformation-preventing core 320.
- the primary-side molding process is next described using FIG. 17 .
- the stationary-side die 200 and the movable-side die 300 are closed, then molten resin for molding of the primary side is injected from the side of the stationary-side die 200, and the primary-side molded article 30 is primarily molded as illustrated in FIG. 17 .
- the slide core 310 of the movable-side die 300 is advanced inside the cavity for molding the secondary-side resin flow paths 80 and 81.
- the secondary-side molding process is next described using FIG. 1 .
- the movable-side die 300 is retracted as illustrated in FIG. 1 .
- the slide core 310 is retracted together with the movable-side die 300 as illustrated in FIG. 1 , but the amount of retraction at this time is set smaller than the amount of retraction of the movable-side die 300, so that the retracted slide core 310 is brought to a stop inside the secondary-side resin flow paths 80 and 81, as illustrated in FIG. 1 .
- molten resin for molding of the secondary side is injected from the side of the stationary-side die 200, and a two-color molded article 10 is molded so that the perimeter of the primary-side molded article 30 is roughly covered by the secondary-side molded article 40, as illustrated in FIG. 1 .
- the molten resin for molding of the secondary side having been injected from the side of the stationary-side die 200, is filled inside the cavity of the stationary-side die 200, and the design face-side molded part 100 for covering the perimeter of the primary-side decorative raised part 60 is secondarily molded.
- the molten resin reaches the dead-end parts 70 and 71 on the perimeter of the primary-side decorative raised part 60, and is filled inside the protective wall 90 through the secondary-side resin flow paths 80 and 81.
- the molten resin having passed through the secondary-side resin flow paths 80 and 81 is filled between the inner perimeter face of the protective wall 90 and the slide core 310 having stopped inside the protective wall 90.
- the molten resin having turned in toward the bottom face side past the perimeter of the primary-side base part 50 is blocked by the protective wall 90 and does not intersect with the molten resin having been filled inside the protective wall 90 through the secondary-side resin flow paths 80 and 81.
- the primary-side molded article 30 and the secondary-side molded article 40 contract at different ratios after secondary molding.
- the perimeter of the primary-side base part 50 of the primary-side molded article 30 is surrounded by resin of the secondary-side molded article 40, and the volume of the design face-side molded part 100 and the volume of the bottom face-side molded part 110 are equal. Therefore, the contraction ratios can be made nearly equal in the top and bottom directions of the two-color molded article 10, and therefore the occurrence of warping in the thickness direction of the two-color molded article 10 can be mitigated.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010022714A JP5432754B2 (ja) | 2010-02-04 | 2010-02-04 | 二色成形品及びその製造方法 |
PCT/JP2011/052169 WO2011096443A1 (ja) | 2010-02-04 | 2011-02-02 | 二色成形品及びその製造方法 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2532504A1 EP2532504A1 (en) | 2012-12-12 |
EP2532504A4 EP2532504A4 (en) | 2015-04-08 |
EP2532504B1 true EP2532504B1 (en) | 2016-04-20 |
Family
ID=44355438
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11739791.9A Not-in-force EP2532504B1 (en) | 2010-02-04 | 2011-02-02 | Two-color molded article and production method thereof |
Country Status (4)
Country | Link |
---|---|
US (1) | US9259869B2 (ja) |
EP (1) | EP2532504B1 (ja) |
JP (1) | JP5432754B2 (ja) |
WO (1) | WO2011096443A1 (ja) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58116139A (ja) * | 1981-12-30 | 1983-07-11 | Hashimoto Forming Co Ltd | 異色部分を有する合成樹脂成形品の製造方法 |
JPS6420109A (en) * | 1987-07-16 | 1989-01-24 | Fujitsu Ltd | Two-color molding method |
DE4142408A1 (de) * | 1991-12-20 | 1993-06-24 | Gao Ges Automation Org | Ausweiskarte sowie verfahren und vorrichtung zur herstellung derselben |
JP3553544B2 (ja) * | 2001-12-25 | 2004-08-11 | 日精樹脂工業株式会社 | 異材質樹脂の複合成形方法及び射出成形機 |
-
2010
- 2010-02-04 JP JP2010022714A patent/JP5432754B2/ja active Active
-
2011
- 2011-02-02 US US13/577,150 patent/US9259869B2/en not_active Expired - Fee Related
- 2011-02-02 WO PCT/JP2011/052169 patent/WO2011096443A1/ja active Application Filing
- 2011-02-02 EP EP11739791.9A patent/EP2532504B1/en not_active Not-in-force
Also Published As
Publication number | Publication date |
---|---|
JP5432754B2 (ja) | 2014-03-05 |
WO2011096443A1 (ja) | 2011-08-11 |
EP2532504A1 (en) | 2012-12-12 |
US9259869B2 (en) | 2016-02-16 |
EP2532504A4 (en) | 2015-04-08 |
US20130004725A1 (en) | 2013-01-03 |
JP2011156836A (ja) | 2011-08-18 |
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